Add support for passing an arbitrary parameter to an IPC message handler. The motivation is for Web…

chrome/browser/extensions/api/alarms/alarms_api_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file tests the chrome.alarms extension API.
 
 #include "base/test/simple_test_clock.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/api/alarms/alarm_manager.h"
 #include "chrome/browser/extensions/api/alarms/alarms_api.h"
@@ skipping 265 matching lines @@
 }
 
 TEST_F(ExtensionAlarmsTest, CreateDelayBelowMinimum) {
   // Create an alarm with delay below the minimum accepted value.
   CreateAlarm("[\"negative\", {\"delayInMinutes\": -0.2}]");
   IPC::TestSink& sink = static_cast<content::MockRenderProcessHost*>(
       contents()->GetRenderViewHost()->GetProcess())->sink();
   const IPC::Message* warning = sink.GetUniqueMessageMatching(
       ExtensionMsg_AddMessageToConsole::ID);
   ASSERT_TRUE(warning);
-  content::ConsoleMessageLevel level = content::CONSOLE_MESSAGE_LEVEL_DEBUG;
-  std::string message;
-  ExtensionMsg_AddMessageToConsole::Read(warning, &level, &message);
+  ExtensionMsg_AddMessageToConsole::Param params;
+  ExtensionMsg_AddMessageToConsole::Read(warning, &params);
+  content::ConsoleMessageLevel level = params.a;
+  std::string message = params.b;
   EXPECT_EQ(content::CONSOLE_MESSAGE_LEVEL_WARNING, level);
   EXPECT_THAT(message, testing::HasSubstr("delay is less than minimum of 1"));
 }
 
 TEST_F(ExtensionAlarmsTest, Get) {
   test_clock_->SetNow(base::Time::FromDoubleT(4));
 
   // Create 2 alarms, and make sure we can query them.
   CreateAlarms(2);
 
@@ skipping 358 matching lines @@
 
   // The next poll should be the first poll that hasn't happened and is in-line
   // with the original scheduling.
   // Last poll was at 380 seconds; next poll should be at 480 seconds.
   EXPECT_DOUBLE_EQ((alarm_manager_->last_poll_time_ +
                        base::TimeDelta::FromSeconds(100)).ToJsTime(),
                    alarm_manager_->next_poll_time_.ToJsTime());
 }
 
 }  // namespace extensions